Check-valve structure.



P. W. HBNNESSY.

CHECK VALVE STRUCTURE.

APPLICATION FILED SEPT. 11. 1914.

Patented Dec. 15. 1914.

PATRICK W. HENNESSY, OF JOPLIN, MISSOURI.

CHECK-VALVE STRUCTURE.

Specification of Letters Patent.

Patented Dec. 15, 19%.

Application filed September 11, 1914. Serial No. 881,258.

T all whom it may concern:

Be it known that I, PATRICK W. HEN- NESSY, a citizen of the United States, residing at Joplin, in the county of Jasper and State of Missouri, have invented certain new and useful Improvements in Check- Valve Structures, of which the following is a specification.

My invention relates to improvements in check-valve structures.

An important object of the invention is to provide a check-valve structure which is so constructed that the flow of water therethrough is not perceptibly retarded by the casing or check-valve thereof while such check-valve is open, and which is simple in construction, inexpensive to manufacture, and formed of few and simple parts which may be readily separated, assembled and adjusted.

Other objects and advantages of the invention will be apparent during the course of the following description. m

In the accompanying drawings forming a port of this specification and in which like numerals are employed to designate like parts throughout the same, Figure 1 IS a central vertical longitudinal sectional view through check-valve structure embodying my invention, 2 is a side elevatlon of the some, Fig. 3 is a plan view of the checkvalve and sent removed, and, Fig. is a fragmentary detail section through a portion of the casting showing slightly different means for connecting the parts thereof.

the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 designates the casing of the valve-structure as a whole, the some being formed in "two casing-sections 6, arranged in end to end relation, with their inner engaging ends provided with a tongue and groove 7, as shown.

In Fig. i, the casing-sections 8 are shown as connected by means of a union-sleeve 8, provided at one end with a flange 9, engaging a flange l0 carried by the upper casingsection 6. This union-sleeve is internally screw-threaded, as shown at 11, for engagement with exterior screw-threads 12, formed upon the adjacent end of the lower casing 6. The union-sleeve 8 is provided with an exterior flange 8, formed polygonal in crosssection, whereby the same may be conveniently engaged and turned by a wrench or the like. This form of connection between the casing-sections 6 is preferred in valve structures of smaller sizes but when the valve structures are made in larger sizes, I prefer to connect the casing-sections thereof, by the means shown in Fig. 4. In Fig. 4, the casing-sections 6 are provided with outwardly extending flanges 12', having openlugs to receive clamping bolts 13, the casingsections having their inner engaging ends preferably provided with grooves, for receiving packing 14 or the like.

The lower casing-section 6 is provided with a preferably internally screw-threaded inlet or inlet-neck 15, having a much smaller diameter than the 'upper end of the lower casing-section 6, such casing-section increasing in diameter upwardly or away from the inlet-neck 15. The upper casing-section 6 is provided with an inlet or inlet-neck 16, of much smaller diameter than the lower end of the some, the upper casingsection increasing in diameter downwardly or away from the outletneck 16. The inlet 15 and outlet 16 are arranged in alinement, thus expediting the passage of the water through the casing. Particular attention is called to the fact that the curvature or tapering of the casing-sections 6 are such with respect to the location of the inlet 15 and outlet 16, that they offer the minimum amount of friction or resistance to the water passing therethrough.

The lower casing-section d is provided with an annular shoulder 17, having a lower inclined wall 18, as shown. Above and adjacent the shoulder 17, the lower casingsection 6 has internal screw-threads 19, for engaging exterior screw threads formed upon an annular valve-seat 20. This annular valve-seat has a lower inclined wall 21, forming with the inclined wall 18, a continuous or unbroken wall, for deflecting the incoming liquid or water through the annular valve-seat, with the least resistance. It is obvious that the valve-seat may be removed or secured to its casing-section 6, by being rotated in the proper direction, and for this reason the same is provided upon its upper side with spaced openings or notches 22, for receiving the teeth of a spanner-wrench (not shown). Preferably formed integral with and arranged inwardly of this, annular valve-seat are spiderarms 23, depending below the same and connected by a tubular sleeve or hub 24, as shown. Mounted to reciprocate within this tubular sleeve or hub 24 is a substantially vertical valve-stem 25, the upward movement of which is limited by a nut 26, carried thereby.

To the upper end of the valve-stem 25 is secured a vertically movable gravity 0 erated check-valve 21, having its lower ace adapted for engagement with the bevel face 28 of the annular valve seat 20, the checkvalve 27 being approximately conical and decreasing in diameter downwardly, as shown. Particular attention is called to the fact that when the check-valve 27 is moved to the full open position, the space between the same and the valve-seat has substantially the same cross-sectional area as the inlet or inlet-neck 15, whereby the passage of the water, through the valve structure is not perg eeptibly retarded.

n o eration, when the water is traveling upwar y, the same enters the inlet or inletneck 15, passes through the lower casin section 6, valve-seat 20, by check-valve 2%, through upper casing-section 6, and outlet or outlet-neck 16. When the pressure is released upon the lower side of the checkvalve 27 it is obvious that the same will instantaneously drop to the closed position, the pressure above the check-valve being upon the central portion thereof.

It is to be understood that the form of my invention herewith shown and described is-to betaken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described the invention, I claim l. A check-valve structure, comprising a lower casing-section provided near its uper end with an internal shoulder having an inclined inner wall, an annular valve-seat passage of the water through the annular valve-seat, a gravity operated check-valve arranged above the annular valve seat to engage therewith and adapted to move away from the same whereby the cross-sectional area of the space between the check-valve and the valve-seat is substantially'equal to the cross-sectional area of the inlet of the lower casing section, a stem secured to the valve and depending therefrom and passin through the sleeve, a stop-member carried by the stem below the sleeve, an upper casing-section engaging the lower casing-section, and means to 10in the casing-sections. A check-valve structure, comprising a lower casing-section provided near its upper end with an internal shoulder having an inclined inner wall, an annular valve-seat having screw-threaded engagement with the casing-section above the shoulder to engage therewith and having a lower inclined wall cotilperating with the. first named inclined we to form therewith a continuous unbroken wall for directing the incomin water through the annular valve-seat wit the least resistance, a depending spider carried by the annular valve-seat and including a sleeve arranged in a plane below the valveseat whereby the same does not obstruct the passage of the water through the annular valve-seat, a gravity operated check-valve arranged above the annular valve seat to en-' gage therewith and adapted to move away from the same whereby the cross-sectional area of the space between the check-valve and the valve-seat is substantially equal to the cross-sectional area of the inlet of the lower casing section, a stem secured to the valve and depending therefrom and passing through the sleeve, a stop-member carried. by the stem below the sleeve, an upper casing-section having a tongue and groove connection with the lower casing-section, and a union sleeve having swiveled connection with one casing-section and screw-threaded engagement with the other casing-section, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

. PATRICK W. HENNESSY.

Witnesses:

N. L. Gnsnrren'r, H. G. CRAWFORD. 

